Peptide inhibitors for mediating stress responses

ABSTRACT

The present invention relates to peptides capable of inhibiting cellular and immune stress responses in a eukaryotic cell. The invention provides compositions and methods for the treatment of human degenerative diseases and inflammation, utilizing these peptides.

RELATED APPLICATIONS

This application is a division of U.S. patent application Ser. No.14/341,814 filed on Jul. 27, 2014, which is a division of U.S. patentapplication Ser. No. 13/287,098 filed on Nov. 1, 2011, now U.S. Pat. No.8,790,653, which is a division of U.S. patent application Ser. No.11/573,707 filed on Apr. 16, 2008, now U.S. Pat. No. 8,067,008, which isa National Phase of PCT Patent Application No. PCT/IL2005/000908 filedon Aug. 23, 2005, which claims the benefit of priority of U.S.Provisional Patent Application No. 60/603,255 filed on Aug. 23, 2004.

The contents of the above applications are all incorporated by referenceas if fully set forth herein in their entirety.

SEQUENCE LISTING STATEMENT

The ASCII file, entitled 63213SequenceListing.txt, created on Jun. 30,2015, comprising 12,030 bytes, submitted concurrently with the filing ofthis application is incorporated herein by reference.

FIELD OF THE INVENTION

The present invention relates to peptides recognized by monoclonalanti-DNA antibodies, the peptides being capable of inhibiting cellularand immune stress responses in a eukaryotic cell, for the treatment ofhuman degenerative disorders and inflammation.

BACKGROUND OF THE INVENTION

Apoptosis

Apoptosis, or programmed cell death, is of fundamental importance tonormal biological processes including embryogenesis, maintenance oftissue homeostasis, cellular development of multicellular organisms,elimination of virus-infected cells, and the development of the immunesystem (Ellis et al., 1991). It is a type of cell death that isfundamentally distinct from degenerative death or necrosis in that it isan active process of gene-directed cellular self-destruction which, insome instances, serves a biologically meaningful homeostatic function.

p53

The p53 protein, originally identified as a tumor-associated antigen, isthe product of a tumor suppressor gene that functions to arrest thegrowth of mutated or aberrant cells (Baker et al, 1990). Functional p53is believed to detect DNA damage (Lee et al, 1995) and subsequentlyinduce DNA repair (Kastan et al, 1991), growth arrest (Kuerbitz et al,1992), or apoptosis (Yonish-Rouach et al, 1991) of the aberrant cells.In particular, p53 controls genomic stability by eliminating geneticallydamaged cells from the cell population, and one of its major functionsis to prevent tumor formation.

The p53 protein has at least two DNA-binding sites:

(1) the core of the p53 protein, which interacts specifically with a DNAsequence in the promoter region of p53 responsive genes (el-Deiry et al,1992); and(2) the C-terminus of the p53 protein, which can recognize featurescommon to damaged DNA in general (Lee et al, 1995; Foord et al, 1991).

The p53 protein is a transcription factor that binds specifically to aconsensus site present in the regulatory sequences of p53-dependentgenes (el-Deiry et al, 1992). Mutation of the p53 gene in the domainencoding sequences involved in binding to the specific DNA regulatorysite causes a loss of tumor suppression. Therefore, it is not surprisingthat a significant proportion of natural human tumors bear mutated p53(Hollstein et al, 1991).

p53 has a short half-life, and, accordingly, is continuously synthesizedand degraded in the cell. However, when a cell is subjected to stress,p53 is stabilized. Examples of cell stress that induce p53 stabilizationare:

-   -   a) DNA damage, such as damage caused by UV (ultraviolet)        radiation, cell mutations, chemotherapy, and radiation therapy;    -   b) hyperthermia;    -   c) hypoxia; and    -   d) deregulation of microtubules caused by some chemotherapeutic        drugs, e.g., treatment using taxol or Vinca alkaloids.

Stress-activated p53 induces a cascade of events that result in growtharrest or apoptosis of the stressed cell, thereby preventing theoutgrowth of aberrant cells and tumor formation (Ko, 1996). However,excessive activation of p53 after severe stress can be harmful to theorganism, as tissue function may be damaged by excessive apoptosis(Komarova, 2001).

Specifically, radiation therapy and chemotherapy exhibit severe sideeffects, such as severe damage to the lymphoid and hematopoietic systemand intestinal epithelia, which limit the effectiveness of thesetherapies. Other side effects, like hair loss, also are p53 mediated andfurther detract from cancer therapies. Therefore, to eliminate or reduceadverse side effects in normal tissues associated with cancer treatment,it would be beneficial to inhibit p53 activity in normal tissue duringtreatment of p53-deficient tumors, and thereby protect normal tissue.

Inactivation of p53 has been considered an undesirable and unwantedevent, and considerable effort has been expended to facilitate cancertreatment by restoring p53 function. However, p53 restoration orimitation causes the above-described problems with respect to damagingnormal tissue cells during chemotherapy or radiation therapy. Thesenormal cells are subjected to stress during cancer therapy, which leadsthe p53 in the cell to cause a programmed death. The cancer treatmentthen kills both the tumor cells and the normal cells.

U.S. Pat. No. 6,593,353 discloses p53 inhibitors in the treatment ofp53-mediated diseases, conditions and injuries.

U.S. Pat. No. 6,420,136 discloses methods for modulating the activity ofthe p53 protein in cells by the addition of a protein which enhances orinhibits the biochemical activity of p53.

U.S. Pat. No. 6,630,584 discloses a single chain antibody whichrecognizes an epitope exposed on mutant, but not on wild-type p53 and aDNA molecule encoding the single chain Fv, pharmaceutical compositionscomprising the antibody and methods of treatment using thepharmaceutical compositions.

p53 and Stress-Associated Response

The adverse effects of p53 activity on an organism are not limited tocancer therapies. p53 is activated as a consequence of a variety ofstresses associated with injuries (e.g., burns) naturally occurringdiseases (e.g., hyperthermia associated with fever, and conditions oflocal hypoxia associated with a blocked blood supply, stroke, andischemia) and cell aging (e.g., senescence of fibroblasts), as well as acancer therapy. Temporary p53 inhibition, therefore, also can betherapeutically effective in: (a) reducing or eliminating p53-dependentneuronal death in the central nervous system, i.e., brain and spinalcord injury, (b) the preservation of tissues and organs prior totransplanting, (c) preparation of a host for a bone marrow transplant,and (d) reducing or eliminating neuronal damage during seizures, forexample.

In addition, various degenerative diseases, including Alzheimer'sdisease, Parkinson's disease, ischemic stroke (Mattson, 2001; Martin,2001), glaucoma (Nickells, 1999) secondary degeneration after trauma(Raghupathi, 2000), myocardial infarction (Haunstetter, 1998) areassociated with excessive cell death of sensitive tissue in response tostress. Therefore, temporary inhibition of stress-related cell death mayserve the prevention and therapy of degenerative diseases (Komarova,2001).

Monoclonal Antibody to the DNA-Binding Domain of p53

Antibodies to DNA are characteristic of many autoimmune diseases,notably systemic lupus erythematosus (SLE) and particularly lupusnephritis. However, there is at present no generally acceptedexplanation for the prevalence of anti-DNA antibodies in autoimmunedisorders Immunity to DNA appears to be driven by an antigen (Radic etal, 1994), but self-DNA is unlikely to be the driving antigen becausemammalian DNA usually does not induce an anti-DNA immune response(Pisetsky, 1996).

It has been reported that immunization with monoclonal antibodies caninduce immune responses that extend beyond the specificity of theantibody, probably by anti-idiotypic connectivity based onidiotypic-determinants in the variable regions of the immunizingmonoclonal antibody.

According to idiotypic antibody network terminology, Ab1 is the firstantibody, the antibody binding to the antigen, and Ab2 is theanti-idiotypic antibody to Ab1. The variable region of Ab2 may mimic theconformation of the antigen because both the antigen and Ab2 can bebound by Ab1. Ab3 is the anti-idiotypic antibody to Ab2. Because of thechain of structural complementarity, Ab1 and Ab3 can have similarspecificity for the original antigen.

The PAb-421 antibody is a prototypic monoclonal antibody that reactswith the C-terminal DNA-binding domain of p53. The sequences of thevariable heavy (V_(H)) and variable light (V_(L)) chains of the anti-p53PAb-421 have been elucidated (see WO 98/56416). The use of PAb-421antibody for the treatment of cancer was suggested, since it activatedDNA binding of p53 in vitro (see WO 94/12202).

The inventors previously reported that immunization of mice with PAb-421induced formation of anti-idiotypic antibodies that also bind DNA(Herkel et al., 2000; and WO 00/23082). Two of these monoclonalanti-idiotypic antibodies, designated Idi-1 and Idi-2, mimicked thebinding properties of the p53 regulatory domain and reacted specificallywith PAb-421 and double- and single stranded DNA.

It was suggested by the present inventors (after the priority date ofthe present invention) that damaged DNA has a chemically definedstructure that is recognized by p53 and by Idi-1 and Idi-2 antibodies(Herkel, et al, 2004). Nowhere in the background art was it taught orsuggested that it is possible to identify novel peptides havinganti-apoptotic and anti-inflammatory properties using suchanti-idiotypic antibodies.

There is an unmet need for novel compositions that may serve toattenuate cellular and immune stress-response in normal tissue, in amanner that is specific, safe and effective, thereby reducing theseverity of stress associated degenerative diseases and stress-inducedinflammation.

SUMMARY OF THE INVENTION

The present invention provides compositions and methods comprisingpeptides for inhibiting cellular and immune stress-response to a varietyof stress-associated conditions. The peptides of the present inventionexhibit anti-apoptotic and anti-inflammatory activity, therebyincreasing cell survival in cells or tissues that are exposed to stress.

While the use of antibodies to p53 for inducing anti-tumor immunity hasbeen described, the present invention demonstrates that anti idiotypicantibodies immunoreactive with anti-p53 antibodies also may be used todefine therapies useful to prevent or decrease cell death.

Unexpectedly, it is now disclosed that peptides, recognized bymonoclonal antibodies generated by idiotypic immunization to an anti-p53monoclonal antibody are of potential use for therapy of humandegenerative diseases and in modifying inflammatory responses. In otherwords, the anti-p53 antibodies (Abs) can generate anti-idiotypic Abs,wherein these latter Abs recognize epitopes useful for preventing celldeath or inflammation.

The invention is based, in part, on experiments demonstrating theefficacy of the peptides of the invention in ameliorating stress-inducedcell death and p53-mediated response, induced by stimuli such asDNA-damaging agents, hyperthermia, toxic stress and γ-irradiation.

Surprisingly, it was further discovered that peptides of the inventionexhibit anti-inflammatory activity, both in vitro and in vivo. Thus, theinvention demonstrates that the peptides of the invention are useful fortreating inflammatory and autoimmune diseases.

According to a first aspect, the invention is directed to peptidescomprising an epitope immunoreactive with an anti-idiotypic antibodydirected against an anti-p53 antibody, wherein the anti-p53 antibody isimmunoreactive with at least a part of the regulatory domain at theC-terminus of p53. The peptides of the invention exhibit at least oneactivity selected from anti-apoptotic activity and anti-inflammatoryactivity.

In one particular embodiment, the peptides are immunoreactive with ananti-idiotypic antibody directed against the anti-p53 antibody PAb-421(Herkel et al., 2000, hereby fully incorporated by reference). In otherparticular embodiments, the peptides are immunoreactive with monoclonalantibodies designated Idi-1 and Idi-2, having structural mimicryproperties to the p53 regulatory domain (Herkel et al., 2004, herebyfully incorporated by reference).

In one embodiment, the anti-idiotypic antibody is a molecule comprisingV_(L)-CDR3 and V_(H)-CDR3 sequences selected from the group consistingof: SEQ ID NO:15 and 18 and SEQ ID NO:21 and 24. In another embodiment,the anti-idiotypic antibody is a molecule comprising V_(L) regions andV_(H) regions selected from the group consisting of SEQ ID NO:9 and 10,SEQ ID NO:11 and 12, analogs and derivatives thereof.

The peptides are characterized and synthesized by methods known in theart. In one embodiment, the peptides are characterized by massspectrometry and synthesized by chemical synthesis.

According to another embodiment, the peptides may have structuralcomplementarity to the DNA-binding domain of p53. Without wishing to bebound to any particular theory or mechanism of action, it is postulatedthat the peptides may be capable of binding p53 therefore preventing p53from binding to damaged-DNA. In another embodiment, the peptides of theinvention exhibit the activity of binding a protein involved inapoptosis. In another embodiment the peptides of the invention exhibitthe activity of preventing said protein from binding to damaged DNA.

According to certain embodiments the peptide comprises a total of about5 to 25 amino acids, preferably the peptide comprises from about 5 toabout 25 amino acids, preferably from about 7 to 12 amino acids.

In certain particular embodiments, the present invention provides novelpeptides having an amino acid sequence selected from the groupconsisting of SEQ ID NO:1 to SEQ ID NO:4, analogs, derivatives or activefragments thereof having anti-apoptotic activity and/oranti-inflammatory activity. The peptides of the present invention are asfollows:

SEQ ID NO:1-LPPLPYP, designated Stressin-1;SEQ ID NO:2-DLSTDALHYRTA, designated Stressin-2;SEQ ID NO:3-HPTNQQSLWRWP, designated Stressin-3;SEQ ID NO:4-SSLSVDYPTRYP, designated Stressin-4.

In other particular embodiments, the derivative is a retro-inversopeptide, having an amino acid sequence as set forth in any one of SEQ IDNOS:5-8:

SEQ ID NO:5—PYPLPPL (all residues in the “D” isomeric form);SEQ ID NO:6—ATRYHLADTSLD (all residues in the “D” isomeric form);SEQ ID NO:7—PWRWLSQQNTPH (all residues in the “D” isomeric form);SEQ ID NO:8—PYRTPYDVSLSS (all residues in the “D” isomeric form).

In one particular embodiment, the peptide has an amino acid sequence asset forth in any one of SEQ ID NOS:1, 2 and 5.

According to other embodiments, the peptides of the present inventionare useful for selectively preventing cell death of normal tissue. Inone embodiment, the peptides inhibit apoptotic activity of mammaliancells. In another embodiment, the peptides inhibit apoptotic activity ofhuman cells.

According to certain preferred embodiments the peptides of the presentinvention are capable of inhibiting apoptotic activity by at least 25%,preferably by at least 50%, more preferably by at least 75% and mostpreferably by at least 95%.

The present invention provides peptides having the ability toeffectively inhibit cellular and immune stress responses in normaltissue, and are useful to treat a disease or condition where inhibitionof intracellular protein activity provides a benefit.

According to some embodiments the peptides of the invention are usefulfor treating stress-associated human degenerative diseases. According toother embodiments the peptides are capable of down regulating immunemediated stress responses.

In other aspects, the invention is directed to an antibody moleculecomprising V_(L)-CDR3 and V_(H)-CDR3 sequences selected from the groupconsisting of: SEQ ID NO:15 and 18 and SEQ ID NO:21 and 24, and usesthereof for the isolation of peptides according to the invention. In oneembodiment, the antibody molecule comprises V_(L) regions and V_(H)regions selected from the group consisting of SEQ ID NO:9 and 10 and SEQID NO:11 and 12.

According to yet another aspect the present invention provides apharmaceutical composition comprising as an active ingredient a peptideof the invention or a salt thereof and a pharmaceutically acceptablecarrier or diluent.

According to another aspect the present invention provides a method formodulating cellular and immune stress-associated responses in a cell ofan organism comprising exposing the cell to an effective amount of apeptide of the invention, an analog, a derivative, or a salt thereof.

Diseases and inflammatory conditions that may be treated by the peptidesof the invention include, but not limited to, Alzheimer's disease,Parkinson's disease, secondary degeneration after trauma, stroke, CNSintoxication, glaucoma, macular degeneration, type 1 diabetes, multiplesclerosis, systemic lupus erythematosis, autoimmune uveitis, graftversus host disease, graft rejection, arthritis, systemic inflammatoryresponse syndrome (SIRS) inflammatory bowel disease (IBD), adultrespiratory distress syndrome (ARDS), psoriasis, atherosclerosis,myocardial infarction, radiation disease, hyperthermia, hypoxia,fulminant toxic liver, kidney failure, infertility and many others.

In another aspect, the invention provides a method for treating adegenerative disease or condition in a subject in need thereof,comprising administering to the subject a therapeutically effectiveamount of a peptide of the invention, an analog, a derivative, or a saltthereof.

In one embodiment, the disease or condition is a stress-associateddegenerative disorder.

In another embodiment, said subject has a neoplastic disorder and isundergoing chemotherapy and/or radiation therapy for the treatment ofcancer.

In another embodiment, the disease or condition is selected from thegroup consisting of: Alzheimer's disease, Parkinson's disease, secondarydegeneration after trauma, stroke, CNS intoxication, glaucoma, maculardegeneration, myocardial infarction, radiation disease, hyperthermia,hypoxia, fulminant toxic liver, kidney failure and infertility.

In another aspect, the invention provides a method for treating aninflammatory disease or condition in a subject in need thereof,comprising administering to the subject a therapeutically effectiveamount of a peptide of the invention, an analog, a derivative, or a saltthereof.

In one embodiment, the disease or condition has an etiology associatedwith production of at least one pro-inflammatory cytokine selected fromIL-6 and TNF-α.

In another embodiment, the disease is an autoimmune disease.

In other embodiments, the disease or condition is selected from thegroup consisting of: type 1 diabetes, multiple sclerosis, systemic lupuserythematosis (SLE), autoimmune uveitis, arthritis, systemicinflammatory response syndrome (SIRS) inflammatory bowel disease (IBD),adult respiratory distress syndrome (ARDS), psoriasis, atherosclerosis,graft rejection and graft versus host disease.

In one particular embodiment, the disease is multiple sclerosis.

In one embodiment, the peptide inhibits apoptotic activity in responseto cellular and immune stress disorders in normal tissue or cells.According to one embodiment the peptides of the present inventionmodulate intracellular protein activity within a cell in vivo. Inanother embodiment, the peptides of the present invention modulateintracellular protein activity within a cell ex vivo.

According to some embodiments the peptide may be administered to thesubject in need thereof by any suitable route of administration,including, but not limited to, orally, topically, transdermally,parenterally

These and other embodiments of the present invention will becomeapparent in conjunction with the figures, description and claims thatfollow.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S)

FIG. 1: DNA content of L12 cells treated with the DNA-damaging agentcisplatin, as a measure for p53-mediated cell death.

FIGS. 2A-B: Cisplatin (80 μM)-induced p53-mediated cell death of mouseembryo fibroblasts.

FIG. 3: The effect of Stressin peptides on BALB/c mice when subjected tobody irradiation at a dose of 6.5 Gy.

FIG. 4: TNF-α secretion of RAW 264.7 macrophages in response tolipopolysaccharide (LPS) or CpG-oligonucleotides is inhibited byStressin-1.

FIG. 5: Interleukin-6 secretion of RAW 264.7 macrophages in response tolipopolysaccharide (LPS) or CpG-oligonucleotides is inhibited byStressin-1.

FIG. 6: Inhibitory effect of Stressin-1 in development of experimentalautoimmune disease (EAE) in mice.

FIG. 7: Amino acid sequences of the variable regions of PAb-421, Idi-1and Idi-2. Complementarity Determining Regions (CDRs) of the light chainor of the heavy chain are aligned. Presented are Idi-1 VL (SEQ ID NO: 9)and VH (SEQ ID NO: 10); Idi-2 VL (SEQ ID NO: 11) and VH (SEQ ID NO: 12);Idi-1 VL CDR1-3 (SEQ ID NOs: 13-15, respectively) and VH CDR1-3 (SEQ IDNOs: 16-18, respectively); Idi-2 VL CDR1-3 (SEQ ID NOs: 19-21,respectively) and VH CDR1-3 (SEQ ID NOs: 22-24, respectively); andPAb-421 VL (SEQ ID NO: 29), VH (SEQ ID NO: 30), VL CDR1-3 (SEQ ID NOs:31-33, respectively) and VH CDR1-3 (SEQ ID NOs: 34-36, respectively).

DETAILED DESCRIPTION OF THE INVENTION

The present invention provides compositions and methods comprisingpeptides for inhibiting cellular and immune stress-response to a varietyof stress-associated conditions. The invention provides compositions andmethods for the treatment of human degenerative diseases andinflammation, utilizing peptides recognized by monoclonal anti-DNAantibodies, the peptides having anti-apoptotic and anti-inflammatoryactivity.

DEFINITIONS

As used herein, the term “Linear Peptide” means a peptide or polypeptidein which the amino acids are linked to one another via an amide bondformed between the alpha-amino group of one and the alpha-carboxylicgroup of another.

As used herein, “cell” refers to a eukaryotic cell. Typically, the cellis of animal origin and can be a stem cell or somatic cells. Suitableanimal cells can be of, for example, mammalian and avian origin.Examples of mammalian cells include human, bovine, ovine, porcine,murine, rabbit cells. The cell may be an embryonic cell, bone marrowstem cell or other progenitor cell. Where the cell is a somatic cell,the cell can be, for example, an epithelial cell, fibroblast, smoothmuscle cell, blood cell (including a hematopoietic cell, red blood cell,T-cell, B-cell, etc.), cardiac muscle cell, macrophage, dendritic cell,neuronal cell (e.g., a glial cell or astrocyte).

In the context of this invention “modulation” means inhibition; i.e., adecrease in expression. This modulation can be measured in ways whichare routine in the art, for example by Western blot or ELISA assay ofprotein expression, or by an immunoprecipitation assay of proteinexpression.

The term “treating” as used herein includes prophylactic and therapeuticuses, and refers to the alleviation of symptoms of a particular disorderin a patient, the improvement of an ascertainable measurement associatedwith a particular disorder, or the prevention of a particular immuneresponse (such as transplant rejection).

Antibodies, or immunoglobulins, comprise two heavy chains linkedtogether by disulfide bonds and two light chains, each light chain beinglinked to a respective heavy chain by disulfide bonds in a “Y” shapedconfiguration. Proteolytic digestion of an antibody yields Fv (Fragmentvariable) and Fc (fragment crystalline) domains. The antigen bindingdomains, Fab′, include regions where the polypeptide sequence varies.The term F(ab′)₂ represents two Fab′ arms linked together by disulfidebonds. The central axis of the antibody is termed the Fc fragment. Eachheavy chain has at one end a variable domain (VH) followed by a numberof constant domains (CH). Each light chain has a variable domain (VL) atone end and a constant domain (CL) at its other end, the light chainvariable domain being aligned with the variable domain of the heavychain and the light chain constant domain being aligned with the firstconstant domain of the heavy chain (CH1).

The variable domains of each pair of light and heavy chains form theantigen binding site. The domains on the light and heavy chains have thesame general structure and each domain comprises four framework regions,whose sequences are relatively conserved, joined by three hypervariabledomains known as complementarity determining regions (CDR1-3). Thesedomains contribute specificity and affinity of the antigen binding site.

The term “antibody” as used herein refers to a polypeptide ligandsubstantially encoded by an immunoglobulin gene or immunoglobulin genes,or fragments thereof, which specifically binds and recognizes an epitope(e.g., an antigen). As used herein, this term refers to intact moleculessuch as polyclonal antibodies or monoclonal antibodies (mAbs),recombinant and engineered antibodies, as well as to fragments thereof,such as Fab, F(ab′)2, Fab miniantibodies (see, for example, U.S. Pat.No. 5,910,573, U.S. Pat. No. 6,294,353, WO 96/37621, U.S. patentapplication Ser. No. 08/999,554), Fv, scFv (e.g. U.S. Pat. Nos.4,946,778, 5,091,513 and 5,096,815) and the like which are capable ofbinding the epitopic determinant. Antibodies used in the invention canbe prepared using intact polypeptides or fragments containing smallpeptides of interest as the immunizing antigen. The polypeptide oroligopeptide used to immunize an animal can be derived from thetranslation of RNA or synthesized chemically and can be conjugated to acarrier protein, if desired. Commonly used carriers that are chemicallycoupled to peptides are exemplified by bovine serum albumin,thyroglobulin and keyhole limpet hemocyanin. The coupled peptide is thenused to immunize the animal (e.g., a mouse, a rat, or a rabbit).Non-limitative methods of generating antibodies are described in theExamples hereinbelow; however, other methods well known in the art mayreadily be used.

By the term “anti-idiotypic antibody” is intended an antibody directedagainst (in other words, immunoreactive with) an idiotypic determinantof another antibody. As used herein, the term “idiotypic determinant”refers to an antigenic determinant or epitope unique to theimmunoglobulin product of a single clone of cells. The idiotope is foundin the variable region of the antibody. The term “epitope” refers to anantigenic determinant on a molecule which is recognized by antibodies.

As used herein, the term “immunoreactive” means that the antibody iscapable of binding the antigen with a binding affinity that isindicative of an immune reaction to the antigen. Such affinities arewell known to those of skill in the art and include affinities of 10⁵ to10¹⁴ M⁻¹. Methods of determining the affinity of an antibody compositionare described in Day, Advanced Immunochemistry, (2^(nd) edition)Wiley-Liss, New York, N.Y. (1990).

Stressin Peptides

According to a first aspect, the invention is directed to peptidescomprising an epitope immunoreactive with an anti-idiotypic antibodydirected against an anti-p53 antibody, wherein the anti-p53 antibody isimmunoreactive with at least a part of the regulatory domain at theC-terminus of p53. The peptides of the invention exhibit at least oneactivity selected from anti-apoptotic activity and anti-inflammatoryactivity, as will be specified hereinbelow.

In one embodiment, the peptides are selected by anti-idiotypicmonoclonal antibodies having structural mimicry properties to the p53regulatory domain. According to certain embodiments, the peptides areimmunoreactive with monoclonal antibodies raised against anti-p53antibodies. In one particular embodiment, the anti-p53 antibody isPAb-421 (Herkel et al., 2000). In other particular embodiments, thepeptides are immunoreactive with monoclonal antibodies designated Idi-1and Idi-2, having structural mimicry properties to the p53 regulatorydomain (Herkel et al., 2004).

In other embodiments, the peptides are immunoreactive with ananti-idiotypic antibody molecule comprising V_(L)-CDR3 and V_(H)-CDR3sequences selected from the group consisting of: SEQ ID NOS:15 and 18,and SEQ ID NOS:21 and 24. In another embodiment, the anti-idiotypicantibody is a molecule comprising CDR sequences selected from the groupconsisting of: SEQ ID NOS:13-18, and SEQ ID NOS:19-24. In anotherembodiment, the anti-idiotypic antibody is a molecule comprising V_(L)regions and V_(H) regions selected from the group consisting of SEQ IDNOS:9 and 10, SEQ ID NOS:11 and 12, analogs thereof.

The peptides are characterized and synthesized by methods known in theart. In one embodiment, the peptides are characterized by massspectrometry and synthesized by chemical synthesis, as described below.

The peptides of the invention are preferably from 5 to 25 amino acids,more preferably from 5 to 15 amino acids and most preferably from 7 to12 amino acids.

According to certain particular embodiment, the present inventionprovides four selected peptides, designated Stressin-1 to 4 (for STressRESponse Specific peptide INhibitor). The amino acid sequences ofcertain peptides of the invention are listed in Table 1 and designatedSEQ ID NO:1 through SEQ ID NO:4.

Unless otherwise specified, the amino acid residues described herein arepreferred to be in the “L” isomeric form. However, residues in the “D”isomeric form can be substituted for any L-amino acid residue, as longas the peptide retains the desired functional property.

In other particular embodiments, the invention provides analogs,fragments and functional derivatives of the peptides designated SEQ IDNO:1 through SEQ ID NO:4, as will be described in detail hereinbelow.According to certain particular embodiments, the derivatives areretro-inverso peptides having an amino acid sequence as set forth in anyone of SEQ ID NOS:5-8, as specified below. In a particular embodiment,the peptide has an amino acid sequence as set forth in any one of SEQ IDNOS:1, 2 and 5.

Previously, mAbs Idi-1 and Idi-2 were demonstrated to specifically bindboth PAb-421 and DNA, single- or double-stranded (Herkel et al., 2000 ofsome of the inventors of the present invention). The present inventionprovides antibody molecules directed to PAb-421 comprising variableregions selected from the group consisting of SEQ ID NOS:9 and 10 andSEQ ID NOS:11 and 12, and antibody molecules comprising CDRs havingamino acid sequences selected from the group consisting of: SEQ IDNOS:13-18 and SEQ ID NOS:19-24. Such antibodies exclude the known mAbstermed Idi-1 and Idi-2.

In one embodiment, the antibody molecule comprises V_(L)-CDR3 andV_(H)-CDR3 sequences selected from the group consisting of: SEQ IDNOS:15 and 18 (corresponding to Complementarity Determining Region 3 ofthe light chain of Idi-1 and Complementarity Determining Region 3 of theheavy chain of Idi-1, respectively) and SEQ ID NOS:21 and 24 (Idi-2). Inanother embodiment, the antibody molecule comprises CDR sequences aspresented in Table 4 below, having amino acid sequences selected fromthe group consisting of: SEQ ID NOS:13-18 (Idi-1) and SEQ ID NOS:19-24(Idi-2). In another embodiment, the antibody molecule comprises V_(L)regions and V_(H) regions (variable regions of an immunoglobulin lightand heavy chain) selected from the group consisting of SEQ ID NOS:9 and10 (Idi-1), SEQ ID NOS:11 and 12 (Idi-2). The antibody molecules of theinvention also include molecules comprising analogs and derivatives ofsaid V_(L) regions and V_(H) regions, as long as the analog orderivative is immunoreactive with the antigen-binding portion ofPAb-421.

In another aspect, the invention provides use of antibody molecules asdescribed above for isolating peptides exhibiting at least one activityselected from the group consisting of anti-apoptotic activity andanti-inflammatory activity. Suitable methods utilizing these antibodiesfor identification and isolation of the peptides of the invention aredisclosed hereinbelow.

Phage Display Library

Phage display peptide libraries have emerged as a powerful method inidentifying such peptide agonists and antagonists. See, for example,Scott et al. (1990), Devlin et al. (1990), U.S. Pat. No. 5,223,409; U.S.Pat. No. 5,733,731; U.S. Pat. No. 5,498,530; U.S. Pat. No. 5,432,018;U.S. Pat. No. 5,338,665; U.S. Pat. No. 5,922,545; WO 96/40987; and WO98/15833. In such libraries, random peptide sequences are displayed byfusion with coat proteins of filamentous phage. Typically, the displayedpeptides are affinity-eluted against an antibody-immobilizedextracellular domain of a receptor. The retained phages may be enrichedby successive rounds of affinity purification and repropagation. Thebest binding peptides may be sequenced to identify key residues withinone or more structurally related families of peptides. See, e.g., Cwirlaet al. (1997), in which two distinct families were identified. Thepeptide sequences may also suggest which residues may be safely replacedby alanine scanning or by mutagenesis at the DNA level. Mutagenesislibraries may be created and screened to further optimize the sequenceof the best binders (Lowman, 1997).

The peptides of the invention were selected and isolated from a phagedisplay library (Ph.D.-7 or Ph.D.-12 from New England Biolabs,Frankfurt, Germany) with an antibody surrogate of the p53 regulatorydomain. The p53 antibody surrogate had been generated by idiotypicimmunization to the PAb-421 monoclonal antibody (Herkel et al., 2000)which binds the p53 regulatory domain; two monoclonal antibodies,designated Idi-1 and Idi-2, mimicked the binding properties of the p53regulatory domain.

The selected candidate peptides were tested for their ability tointerfere with the p53-mediated cellular stress response by testingtheir capacity to inhibit the response to hyperthermia of the L12 cellline (Wolf, 1984), which lacks endogenous p53 activity and had beenstably transfected with the p53 gene or a control vector. In thesecells, p53 activity induces growth arrest and cell survival rather thanapoptosis in response to hyperthermia (Nitta, 1997).

Four peptides, designated Stressin-1 to -4 (for STress RESponse Specificpeptide INhibitor), were identified that at concentrations of 100 μg/mlinhibited p53-mediated growth arrest after hyperthermia and induceddeath of almost all cells with active p53, which is the response of L12cells that lack p53 activity (Table 1); the peptide sequences are shownin Table 2.

Alternative Methods for Identifying and Isolating Peptides

Structural analysis of protein-protein interaction may also be used tosuggest peptides that mimic the binding activity of large proteinligands. In such an analysis, the crystal structure may suggest theidentity and relative orientation of critical residues of the largeprotein ligand, from which a peptide may be designed (see, e.g.,Takasaki et al., 1997). These analytical methods may also be used toinvestigate the interaction between a receptor protein and peptidesselected by phage display, which may suggest further modification of thepeptides to increase binding affinity.

Other methods compete with phage display in peptide research. A peptidelibrary can be fused to the carboxyl terminus of the lac repressor andexpressed in E. coli. Another E. coli-based method allows display on thecell's outer membrane by fusion with a peptidoglycan-associatedlipoprotein (PAL). Hereinafter, these and related methods arecollectively referred to as “E. coli display”. In another method,translation of random RNA is halted prior to ribosome release, resultingin a library of polypeptides with their associated RNA still attached.Hereinafter, this and related methods are collectively referred to as“ribosome display”. Other methods employ chemical linkage of peptides toRNA; see, for example, Roberts and Szostak (1997). Hereinafter, this andrelated methods are collectively referred to as “RNA-peptide screening”.Chemically derived peptide libraries have been developed in whichpeptides are immobilized on stable, non-biological materials, such aspolyethylene rods or solvent-permeable resins. Another chemicallyderived peptide library uses photolithography to scan peptidesimmobilized on glass slides. Hereinafter, these and related methods arecollectively referred to as “chemical-peptide screening”.Chemical-peptide screening may be advantageous in that it allows use ofD-amino acids and other unnatural analogues, as well as non-peptideelements. Both biological and chemical methods are reviewed in Wells andLowman (1992).

Phage display, in particular, is useful in generating peptides for usein the present invention. It has been stated that affinity selectionfrom libraries of random peptides can be used to identify peptideligands for any site of any gene product (Dedman et al., 1993). Phagedisplay is particularly well suited for identifying peptides that bindto such proteins of interest as cell surface receptors or any proteinshaving linear epitopes (Wilson et al., 1998; Kay et al., 1998).

Synthesis of Peptides of the Invention

The peptides of the invention can be produced by any known chemical andrecombinant methods of producing an amino-acid sequence, includingpeptidomimetic methodologies (Allen G., 1989; Young, 1963; Meienhofer,1973; Schroder and Lupke, 1965). Chemical synthesis is commonlyperformed by coupling of the amino acid residues or peptide fragments toone another in correct order in liquid phase to produce the desiredpeptide. Another common strategy is the coupling of the amino acids toone another starting with a solid phase (resin) to which the C-terminalof the last amino acid of the sequence is coupled, whereupon theC-terminal of the penultimate amino acid is coupled to the N-terminal ofthe last amino acid, etc., finally releasing the built-up peptide fromthe solid phase (so called solid-phase technique).

The term “peptide” refers to molecules of 2 to 25 amino acids, withmolecules of 5 to 20 amino acids preferred and those of 7 to 12 aminoacids most preferred. Exemplary peptides may be randomly generated byany of the methods cited above, carried in a peptide library (e.g., aphage display library), or derived by digestion of proteins.

The present invention encompasses any analog, derivative, and conjugatecontaining the peptides of the invention, the amino acid sequence ofwhich is shown herein so long as the peptide is capable of inhibitingapoptosis and/or inflammation. Thus, the present invention encompassespeptides containing non-natural amino acid derivatives or non-proteinside chains.

The term “analog” includes any peptide or polypeptide having an aminoacid sequence substantially identical to one of the sequencesspecifically shown herein in which one or more residues have beenconservatively substituted with a functionally similar residue and whichdisplays the abilities as described herein. Examples of conservativesubstitutions include the substitution of one non-polar (hydrophobic)residue such as isoleucine, valine, leucine or methionine for another,the substitution of one polar (hydrophilic) residue for another such asbetween arginine and lysine, between glutamine and asparagine, betweenglycine and serine, the substitution of one basic residue such aslysine, arginine or histidine for another, or the substitution of oneacidic residue, such as aspartic acid or glutamic acid for another.

A peptide derivative refers to a molecule comprising the amino acidsequence of a peptide of the invention subject to various changes,including, but not limited to, chemical modifications, substitutions,insertions, extensions and deletions where such changes do not destroythe anti-inflammatory or anti-apoptotic activity of the peptide, andsuch derivative is not a known peptide or protein. “Peptide derivative”is intended to include peptide mimetics, as described hereinbelow. Inthis regard, a peptide of this invention corresponds to, and preferablyis identical to, one of the peptides listed in Table 1, where one ormore changes are made so long as the polypeptide retains the inhibitoryfunction of peptide of the invention in one or more of the assays asdefined herein. With respect to the antibody molecules of the invention,a variable region derivative retains the ability to specifically bind(i.e. is immunoreactive with) the idiotypic determinant of PAb-421.

Peptide derivatives having chemical modifications include, for example,peptides having one or more residues chemically derivatized by reactionof side chains or functional groups. Such derivatized molecules include,for example, those molecules in which free amino groups have beenderivatized to form amine hydrochlorides, p-toluene sulfonyl groups,carbobenzoxy groups, t-butyloxycarbonyl groups, chloroacetyl groups orformyl groups. Free carboxyl groups may be derivatized to form salts,methyl and ethyl esters or other types of esters or hydrazides. Freehydroxyl groups may be derivatized to form O-acyl or O-alkylderivatives. The imidazole nitrogen of histidine may be derivatized toform N-im-benzylhistidine. Also included as chemical derivatives arethose peptides, which contain one or more naturally occurring amino acidderivatives of the twenty standard amino acid residues. For example:4-hydroxyproline may be substituted for proline; 5-hydroxylysine may besubstituted for lysine; 3-methylhistidine may be substituted forhistidine; homoserine may be substituted or serine; and ornithine may besubstituted for lysine.

In addition, a peptide derivative can differ from the natural sequenceof the peptides of the invention by chemical modifications including,but are not limited to, terminal-NH₂ acylation, acetylation, orthioglycolic acid amidation, and by terminal-carboxyl-amidation, e.g.,with ammonia, methylamine, and the like.

Peptides of the present invention also include any peptide having one ormore additions and/or deletions of residues relative to the sequence ofthe peptides of the invention, the sequence of which are shown herein,so long as the requisite inhibitory activity on apoptosis and/orinflammation is maintained. The term “active fragment” thus relates to apeptide portion of a full length Stressin peptide of the invention thathas at least one activity that is characteristic of the correspondingfull-length peptide. Non-limitative examples of suitable methods formeasuring inhibition of apoptosis and inflammation are demonstratedherein.

Addition of amino acid residues may be performed at either terminus ofthe peptides of the invention for the purpose of providing a “linker” bywhich the peptides of this invention can be conveniently bound to acarrier. Such linkers are usually of at least one amino acid residue andcan be of 40 or more residues, more often of 1 to 10 residues. Typicalamino acid residues used for linking are tyrosine, cysteine, lysine,glutamic and aspartic acid, or the like.

A peptide of the invention may also be conjugated to itself oraggregated in such a way as to produce a large complex containing thepeptide. Such large complex may be advantageous because it has newbiological properties such as longer half-life in circulation or greateractivity.

Peptide Mimetic

Peptidomimetics are small molecules that can bind to proteins bymimicking certain structural aspects of peptides and proteins. They areused extensively in science and medicine as agonists and antagonists ofprotein and peptide ligands of cellular and other receptors, and assubstrates and substrate analogs for enzymes.

A primary goal in the design of peptide mimetics has been to reduce thesusceptibility of mimics to cleavage and inactivation by peptidases. Inone approach, one or more amide bonds have been replaced in anessentially isosteric manner by a variety of chemical functional groups,including, but not limited to urea bond, carbamate bond, sulfonamidebond, hydrazine bond, or any other covalent bond. In another approach, avariety of uncoded or modified amino acids such as D-amino acids andN-methyl amino acids have been used to modify mammalian peptides.

To test whether Stressin peptide may protect an organism from death byexcessive p53 activation and tissue failure by subjecting BALB/c mice towhole body γ-irradiation (6.5 Gy). A retro-inverso peptide was used todetermine whether prolonged in vivo half-life would give an advantage(see Example 6); retro-inverso peptides are resistant to proteases andconsist of D-amino acids in reversed order, resulting in an alteredpeptide backbone but unchanged orientation of the side chains (VanRegenmortel, 1998).

As used herein, the term “retro-inverso peptide” of the Stressin-1peptide, for example, as used in a variation of the invention, isintended to encompass peptides in which the sequence of the amino acidsis reversed as compared to the sequence in Stressin-1 and consist ofD-amino acids in reversed order.

The present invention thus provides retro-inverso Stressin peptideshaving an amino acid sequence as set forth in any one of SEQ ID NOS:5-8.

The backbone can comprise a variety of atom types, including carbon,nitrogen, oxygen, sulfur and phosphorus, with the majority of thebackbone chain atoms typically consisting of carbon. A plurality of sidechain moieties that include a terminal guanidino or amidino group areattached to the backbone. Although spacing between adjacent sidechainmoieties is typically consistent, the delivery-enhancing transportersused in the invention can also include variable spacing betweensidechain moieties along the backbone.

Cell Death and p53 Inhibition

Apoptosis, or “programmed cell death”, is a process whereby the cellexecutes a “cell suicide” program. It is now thought that the apoptosisprogram is evolutionarily conserved among virtually all multicellularorganisms, as well as among all the cells_in a particular organism.Further, it is believed that in many cases, apoptosis may be a “default”program that must be actively inhibited in healthy surviving cells.

The decision by a cell to submit to apoptosis may be influenced by avariety of regulatory stimuli and environmental factors (Thompson,1995). Physiological activators of apoptosis include tumor necrosisfactor (TNF), Fas ligand, transforming growth factor-β, theneurotransmitters glutamate, dopamine, N-methyl-D-aspartate, withdrawalof growth factors, loss of matrix attachment, calcium andglucocorticoids. Damage-related inducers of apoptosis include heatshock, viral infection, bacterial toxins, the oncogenes myc, rel andE1A, tumor suppressor p53, cytolytic T-cells, oxidants, free radicalsand nutrient deprivation (antimetabolites). Therapy-associated apoptosisinducers include gamma radiation, UV radiation and a variety ofchemotherapeutic drugs, including cisplatin, doxorubicin, bleomycin,cytosine arabinoside, nitrogen mustard, methotrexate and vincristine.Toxin-related inducers or apoptosis include ethanol and d-amyloidpeptide. Apoptosis can have particularly devastating consequences whenit occurs pathologically in cells that do not normally regenerate, suchas neurons. Because such cells are not replaced when they die, theirloss can lead to debilitating and sometimes fatal dysfunction of theaffected organ. Such dysfunction is evidenced in a number ofneurodegenerative disorders that have been associated with increasedapoptosis, including Alzheimer's disease, Parkinson's disease,amyotrophic lateral sclerosis, retinitis pigmentosa and cerebellardegeneration.

In one aspect, this invention provides compositions and methods forpreventing or inhibiting apoptosis in eukaryotic cells. Irrespective ofthe mechanism by which the peptides of the invention mediates stressresponses, and without wishing to be bound by any theory or mechanism ofaction, it is postulated that the peptides may be capable of binding p53therefore preventing p53 to be bound to damaged-DNA.

A potential therapeutic inhibitor of p53 is a compound that acts at anystage of the p53 signaling pathway, and leads to functional inactivationof a p53-mediated response (i.e., blocking of p53-dependent growtharrest, apoptosis, or both). Prior investigators did not considertherapeutic p53 inhibitors because therapeutic p53 suppression wasconsidered a disadvantage leading to the onset and proliferation ofcancerous tumors. The present invention, therefore, is directed to thetherapeutic and reversible inhibition of p53 activity, and to peptidescapable of such inhibition.

However, there are several objectives that should be mentioned before atherapy involving suppression of p53 or any other protein that plays arole in apoptosis or inflammation-related disorders is implemented, forexample:

-   -   a) providing an inhibitor that is sufficiently efficacious in        vivo for practical administration as a therapeutic drug;    -   b) providing an inhibitor that has a sufficiently low toxicity        for use in therapy, and also does not cause undesirable side        effects at concentrations sufficient to inhibit p53 activity;    -   c) exhibiting inhibition that is reversible. Long-term p53        inactivation, for example, can significantly increase the risk        of cancer;    -   d) during temporary p53 inactivation, the cells should recover        from the applied stress and the p53-activating signal should be        eliminated or reduced, otherwise restoration of p53 activity        while the p53-activating signal is active could result in cell        damage;    -   e) the p53 suppression therapy is not associated with a dramatic        increase in the frequency of cancer development.

The peptides of the invention can be used alone, or, for example, inconjunction with chemotherapy or radiation therapy during cancertreatment, to protect normal cells from p53 programmed death due tostresses inflicted by a cancer treatment or by a disease or trauma. Inaddition, during chemotherapy, both tumor and normal cells aredestroyed. Tumor cells are preferentially killed compared to normalcells, which is the basis of a successful chemotherapy. By administeringa therapeutic p53 inhibitor, for example, normal cells are protected,and the dose of the chemotherapeutic agent, therefore, can be increasedto more effectively treat the cancer.

It should be understood that the peptides of the present invention donot necessarily act via modulating p53 activity as some of thesepeptides exhibited anti-apoptotic activity in p53-deficient cell linesand in p53 activity assays.

Methods to Measure Apoptosis

Apoptosis is an active, gene-directed self-destruction process of thecell and is associated with characteristic morphological and biochemicalchanges. Nuclear and cytoplasmic condensation and fragmentation of thedying cell into membrane-bound apoptotic bodies are typicalcharacteristics of apoptosis. Another feature of apoptotic cell death isthe chromosomal DNA degradation into oligonucleosomal fragments afterthe activation of specific nucleases.

By “inhibiting apoptosis” or “inhibits apoptotic activity” is meant anydecrease in the number of cells that undergo apoptosis relative to anuntreated control (i.e. cells not exposed to the peptides of theinvention). Preferably, the decrease is at least 25%, more preferablythe decrease is at least 50%, and most preferably the decrease is atleast one-fold.

Flow cytometry offers a wide variety of possibilities to measureapoptosis. Different methods have been established and implemented, somewhich stain on the cell surface and some which stain intracellularly.

One of the first approaches was, beside the observation that apoptoticcells shrink and have higher intracellular granularity, to stain withDNA specific fluorochromes (e.g. propidium iodide [PI], ethidium bromide[EtBr]). As soon as a lethal hit is being induced, the DNA starts tochange its profile. Apoptotic DNA not only consists of fragmented DNA(visualized as shorter bands, so called DNA ladder, in an agarose gel)but is also partially digested into single nucleotides, so thatfluorochromes, like PI or EtBr, have less DNA to stain (Nicoletti etal., 1991). This is typically observed by a shift to the left, calledsub-G1 peak, on the specific fluorochrome detection channel in theFACScan™ (from Becton Dickinson, USA).

Another method is the terminal deoxynucleotidyl transferase(TdT)-mediated endlabeling of the DNA strand breaks (TUNEL). The TUNELmethod detects DNA strand breaks in cells undergoing apoptosis. TdT isan enzyme which catalyzes the addition of deoxyribonucleotidetriphosphate to the 3′-OH ends of double or single-stranded DNA. Unlikenormal cells, apoptotic cell nuclei incorporate exogenous nucleotides(dUTP)-DIG in the presence of TdT. An anti-DIG antibody fragment with aconjugated fluorochrome enables the visualization of apoptotic cells. Anincrease of apoptotic cells causes a higher number of DNA fragments andconsequently a brighter fluorescence. An advantage of this method is thevery high specificity (Gavrieli et al., 1992). A disadvantage of thismethod is that it is expensive and can only be used for a small set ofsamples, because it is time intensive. Therefore, it is not applicablefor large screening programs

The loss of cell membrane polarity and the presentation of increasedamounts of phosphatidyl serine (PS) on the outside of the cell membraneduring the early phase of apoptosis has led to yet a new approach.Annexin V is a calcium-dependent phospholipid binding protein with highaffinity for PS. The cell membrane integrity is maintained in the earlyand intermediate phases of apoptosis. Early and intermediate apoptoticcells show increased binding of Annexin-FITC and are mainly negative forPI-staining. Late apoptotic stages and necrotic cells become doublepositive, because of PS presentation on the surface and the PI stainingof intracellular nucleic acids due to disintegration of the membrane.This method is also costly and labor intensive.

Other methods for measuring apoptosis in vivo and in vitro are disclosedin U.S. Pat. Nos. 6,726,895 and 6,723,567.

Inflammatory Stress Responses and TNF-α and IL-6 Mediated Inflammation

The mammalian response to stress includes not only the response of thestressed cell, but also the complex activity of the immune system knownas inflammation (Nathan et al., 2002), which includes a large number ofimmune activities that serve tissue maintenance and healing (Cohen,2000).

Tumor necrosis factor (TNF) and interleukin-6 (IL-6) are importantbiological entities collectively referred to as pro-inflammatorycytokines. These, along with several other related molecules, mediatethe inflammatory response associated with the immunological recognitionof infectious agents. The inflammatory response plays an important rolein limiting and controlling pathogenic infections.

Elevated levels of pro-inflammatory cytokines are also associated with anumber of diseases of autoimmunity such as toxic shock syndrome,rheumatoid arthritis, osteoarthritis, diabetes and inflammatory boweldisease (Dinarello, et al., 1984). In these diseases, chronic elevationof inflammation exacerbates or causes much of the pathophysiologyobserved.

An important and accepted therapeutic approach for potential drugintervention in these diseases is the reduction of pro-inflammatorycytokines such as TNF (also referred to in its secreted cell-free formas TNF-α) and IL-6. A number of anti-cytokine therapies are currently inclinical trials. Efficacy has been demonstrated with a monoclonalantibody directed against TNF-α in a number of autoimmune diseases(Heath, 1997). These include the treatment of rheumatoid arthritis,Crohn's disease and ulcerative colitis (Rankin, 1997, and Stack et al.,1997). The monoclonal antibody is thought to function by binding to bothsoluble TNF-α and to membrane bound TNF.

Traumatic brain injury triggers a cascade of events resulting in delayededema, necrosis and impaired function. Harmful mediators areaccumulating in the brain after injury and recently, the role ofcytokines in the pathophysiology of brain injury has been suggested.Spatial and temporal induction of TNF-α and IL-6 activity in rat brainafter closed head injury has been previously reported. An inhibitor ofTNF-α production, HU-211, was shown to improve the outcome of closedbrain injury in an experimental model (Shohami, et al., 1997).Atherosclerosis is known to have an inflammatory component and cytokinessuch as IL-1 and TNF have been suggested to promote the disease.

The pro-inflammatory cytokine IL-6 has been implicated with the acutephase response. IL-6 is a growth factor in a number in oncologicaldiseases including multiple myeloma and related plasma cell dyscrasias(Treon, et al., 1998). It has also been shown to be an importantmediator of inflammation within the central nervous system. Elevatedlevels of IL-6 are found in several neurological disorders includingAIDS dementia complex, Alzheimer's disease, multiple sclerosis, systemiclupus erythematosus, CNS trauma and viral and bacterial meningitis(Gruol et al., 1997). IL-6 also plays a significant role inosteoporosis. In murine models it has been shown to effect boneresorption and to induce osteoclast activity (Ershler et al., 1997).

WO 01/01986 discloses particular compounds alleged to having the abilityto inhibit TNF-α. WO 98/52558 discloses heteroaryl urea compounds whichare indicated to be useful in treating cytokine mediated diseases. WO99/23091 discloses another class of urea compounds which are useful asanti-inflammatory agents. WO 99/32463 relates to aryl ureas and theiruse in treating cytokine diseases and proteolytic enzyme mediateddisease.

The present invention shows that Stressin peptides are useful ininterfering and blocking both TNF-α and IL-6 secretion by macrophagecells in response to innate activators such as lipopolysaccharide (LPS)and CpG oligonucleotides (see Example 7). Therefore, these peptides areable to modify the pro-inflammatory signaling pathway in immune cells.As is demonstrated for Stressin-1 below, the peptides of the inventionplay a role in down-regulating the inflammatory immune response tostress.

The present invention further demonstrates the anti-inflammatoryproperties of Stressin peptides on autoimmune inflammatory diseases, asexemplified on experimental autoimmune encephalomyelitis (EAE), ananimal model of human multiple sclerosis (see Example 8).

Pharmaceutical Compositions and Therapeutic Use

In another aspect, the invention relates to a pharmaceutical compositioncomprising a therapeutically effective amount of a peptide of theinvention and a pharmaceutically acceptable carrier.

As used herein a “pharmaceutical composition” refers to a preparation ofone or more of the agents described herein, or physiologicallyacceptable salts or solvents thereof, with other chemical componentssuch as physiologically suitable carriers and excipients. The purpose ofa pharmaceutical composition is to facilitate administration of acompound to an organism.

The preparation of pharmaceutical compositions, which contain peptidesor polypeptides as active ingredients is well known in the art.Typically, such compositions are prepared as indictable, either asliquid solutions or suspensions, however, solid forms, which can besuspended or solubilized prior to injection, can also be prepared. Thepreparation can also be emulsified. The active therapeutic ingredient ismixed with inorganic and/or organic carriers, which are pharmaceuticallyacceptable and compatible with the active ingredient. Carriers arepharmaceutically acceptable excipients (vehicles) comprising more orless inert substances when added to a pharmaceutical composition toconfer suitable consistency or form to the composition. Suitablecarriers are, for example, water, saline, dextrose, glycerol, ethanol,or the like and combinations thereof. In addition, if desired, thecomposition can contain minor amounts of auxiliary substances such aswetting or emulsifying agents and pH buffering agents, which enhance theeffectiveness of the active ingredient.

Toxicity and therapeutic efficacy of the peptides described herein canbe determined by standard pharmaceutical procedures in cell cultures orexperimental animals, e. g., by determining the IC₅₀ (the concentrationwhich provides 50% inhibition) and the LD₅₀ (lethal dose causing deathin 50% of the tested animals) for a subject compound. The data obtainedfrom these cell culture assays and animal studies can be used informulating a range of dosage for use in human. The dosage may varydepending upon the dosage form employed and the route of administrationutilized. The exact formulation, route of administration and dosage canbe chosen by the individual physician in view of the patient'scondition. (See e.g., Fingl et al., 1975).

The amount of active agent used in an administration composition of thepresent invention is an amount effective to accomplish the purpose ofthe particular active agent for the target indication. The amount ofactive agent in the compositions typically is a pharmacologically,biologically, therapeutically, or chemically effective amount. However,the amount can be less than that amount when the composition is used ina dosage unit form because the dosage unit form may contain a pluralityof compounds or active agents in a single composition or may contain adivided pharmacologically, biologically, therapeutically, or chemicallyeffective amount. The total effective amount can then be administered incumulative units containing, in total, an effective amount of the activeagent.

A therapeutically effective amount of a peptide of the invention is anamount that when administered to a patient is capable of exerting ananti-apoptotic activity and/or an anti-inflammatory activity. Assays fordetecting the anti-apoptotic activity of the peptide of the inventioninclude, but are not limited to, staining DNA with specificfluorochromes such as propidium iodide and ethidium bromide, Annexin Vassays, TUNEL assays and the like; certain non-limitative examples ofsuch assays are presented in the Examples below. Assays for detectinganti-inflammatory activity of the peptides are also well known in theart; non-limitative examples of such methods are presented in theExamples below.

Although an appropriate dosage of a peptide of the invention variesdepending on the administration route, age, body weight sex orconditions of the patient, and should be determined by the physician inthe end, the dose suitable for adult humans can generally be betweenabout 0.2-2000 mg/kg body weight, preferably between about 2-200 mg/kg.

The pharmaceutical compositions of the present invention comprises oneor more compounds of the present invention, and one or more excipientsor diluents. In one embodiment, one or more of the compounds, orsolvates, or salts of these compounds.

The term “pharmaceutically acceptable salt” as used herein, refers tosalts which are substantially non-toxic to living organisms. Typicalpharmaceutically acceptable salts include those salts prepared byreaction of the compounds of the present invention with apharmaceutically acceptable mineral or organic acid. Such salts are alsoknown as acid addition salts.

The compositions comprising the compounds and active agents have utilityin the delivery of active agents to selected biological systems and inan increased or improved bioavailability of the active agent compared toadministration of the active agent without the delivery agent. Deliverycan be improved by delivering more active agent over a period of time,or in delivering active agent in a particular time period (such as toeffect quicker or delayed delivery) or over a period of time (such assustained delivery).

Pharmaceutical compositions for use in accordance with the presentinvention thus may be formulated in conventional manner using one ormore physiologically acceptable carriers comprising excipients andauxiliaries, which facilitate processing of the active compounds intopreparations which can be used pharmaceutically. Proper formulation isdependent upon the route of administration chosen.

The pharmaceutical compositions can be administered locally orsystemically by any conventional and appropriate route including, butnot limited to, oral, intraperitoneal, parenteral, intravenous,intramuscular, subcutaneous, transdermal, intrathecal, topical, rectal,buccal, inhalational or intranasal.

For injection, the compounds of the invention may be formulated inaqueous solutions, preferably in physiologically compatible buffers suchas Hank's solution, Ringer's solution, or physiological saline buffer.For transmucosal administration, penetrants appropriate to the barrierto be permeated are used in the formulation. Such penetrants for exampleDMSO, or polyethylene glycol are generally known in the art.

Pharmaceutical compositions, which can be used orally, include push-fitcapsules made of gelatin as well as soft, sealed capsules made ofgelatin and a plasticizer, such as glycerol or sorbitol. The push-fitcapsules may contain the active ingredients in admixture with fillersuch as lactose, binders such as starches, lubricants such as talc ormagnesium stearate and, optionally, stabilizers.

In soft capsules, the active compounds may be dissolved or suspended insuitable liquids, such as fatty oils, liquid paraffin, or liquidpolyethylene glycols. In addition, stabilizers may be added. Allformulations for oral administration should be in dosages suitable forthe chosen route of administration.

Alternatively, the compounds of the present invention can beincorporated into oral liquid preparations such as aqueous or oilysuspensions, solutions, emulsions, syrups, or elixirs, for example.Moreover, formulations containing these compounds can be presented as adry product for constitution with water or other suitable vehicle beforeuse. Such liquid preparations can contain conventional additives, likesuspending agents, such as sorbitol syrup, methyl cellulose,glucose/sugar syrup, gelatin, hydroxyethylcellulose, carboxymethylcellulose, aluminum stearate gel, and hydrogenated edible fats;emulsifying agents, such as lecithin, sorbitan monooleate, or acacia;nonaqueous vehicles (which can include edible oils), such as almond oil,fractionated coconut oil, oily esters, propylene glycol, and ethylalcohol; and preservatives, such as methyl or propyl p-hydroxybenzoateand sorbic acid.

For administration by inhalation, the peptides for use according to thepresent invention are conveniently delivered in the form of an aerosolspray presentation from a pressurized pack or a nebulizer with the useof a suitable propellant, e. g., dichlorodifluoromethane,trichlorofluoromethane, dichloro-tetrafluoroethane or carbon dioxide. Inthe case of a pressurized aerosol, the dosage unit may be determined byproviding a valve to deliver a metered amount. Capsules and cartridgesof, e.g., gelatin for use in an inhaler or insufflator may be formulatedcontaining a powder mix of the peptide and a suitable powder base suchas lactose or starch.

The pharmaceutical compositions of the invention are also useful fortopical and intralesional application. As used herein, the term“topical” means “pertaining to a particular surface area”, e.g. skin andmucosa, and the topical agent applied to a certain area of said surfacewill affect only the area to which it is applied. The formulations ofthe peptides/peptide analogs may be administered topically as a gel,ointment, cream, emulsion, sustained release formulation including atransdermal patch, and may comprise liposomes and any otherpharmaceutically acceptable carrier suitable for administration of thedrug topically. The pharmaceutical compositions herein described mayalso comprise suitable solid of gel phase carriers or excipients.Examples of such carriers or excipients include, but are not limited to,calcium carbonate, calcium phosphate, various sugars, starches,cellulose derivatives, gelatin and polymers such as polyethyleneglycols.

In another aspect, the invention provides a method for modulatingcellular and immune stress-associated responses in a cell of an organismcomprising exposing the cell to an effective amount of a peptide of theinvention.

In other aspects, the present invention relates to methods of treatingor preventing the symptoms of inflammatory conditions and/ordegenerative diseases and disorders, comprising administering to apatient suffering from the disease a therapeutically effective amount ofa peptide of the invention. Yet another aspect of the present inventionis to provide a method of reducing or eliminating death of normal cellsattributable to trauma or a disease comprising administering atherapeutically effective amount of a peptide according to the inventionto an organism to inhibit stress-related protein activity.

In certain embodiments, the peptide is in the form of a pharmaceuticalcomposition comprising an effective amount of said peptide and apharmaceutically acceptable carrier or diluent.

Stress associated responses are associated with diseases and disordersincluding, for example, pathological conditions such asneurodegenerative diseases (e.g. stroke, Parkinson's, and Alzheimer'sdisease), myocardial infarction, exposure to radiation orchemotherapeutic agents, inflammation, injuries (e.g., burns and centralnervous system injuries), cell aging, hyperthermia, seizures, hypoxias(e.g., ischemia and stroke), and in transplant tissues and organs priorto transplanting.

These conditions also include autoimmune diseases, characterized by astate of immunization of an individual against at least one of thebody's normal constituents. These phenomena are observed in particularin pathologies including, but not limited to infections associated withSLE (Systemic Lupus Erythematosus disease), Gougerot-Sjogren syndrome(or Sjogren's disease) and rheumatoid polyarthritis, as well aspathologies such as sarcoidosis and osteopenia, spondylarthritis,scleroderma, multiple sclerosis, amyotrophic lateral sclerosis,hyperthyroidism, Addison's disease, autoimmune hemolytic anemia, Crohn'sdisease, Goddpasture's syndrome, Graves' disease, Hashimoto'sthyroiditis, idiopathic purpural hemorrhage, insulin-dependent diabetes,myasthenia, pemphigus vulgaris, pernicious anemia, poststreptococcalglomerulonephritis, psoriasis and spontaneous sterility, as well asimmediate or delayed phenomena observed during graft rejections andgraft-versus host disease. In one particular embodiment, the peptides ofthe invention are useful for the treatment of multiple sclerosis, asexemplified in Example 8 herein.

The phenomenon of graft rejection is a state of immunization of anindividual against foreign constituents (bodily fluids such as blood,cerebrospinal fluid, etc., cells, tissues, organs, antibodies, etc.)deliberately implanted into the patient.

As used herein, the terms “degenerative disorder” “degenerative disease”and “degenerative condition” are directed to any disorder, disease orcondition characterized by inappropriate cell proliferation orinappropriate cell death or in some cases, both, or aberrant ordisregulated apoptosis. These conditions also include conditions inwhich, although appropriate and regulated at the level of a single cell,excessive apoptosis is associated with organ dysfunction or failure.

In one embodiment, the peptides are useful to prevent cell death innon-malignant tissue or cells in a subject having a neoplastic disorderand undergoing chemotherapy and/or radiation therapy for the treatmentof cancer.

The terms “inflammatory disease” and “inflammatory condition”, as usedherein, mean any disease or condition in which an excessive orunregulated inflammatory response leads to excessive inflammatorysymptoms, host tissue damage, or loss of tissue function.

In one embodiment, the inflammatory disease or condition is anautoimmune disease. In a particular embodiment, the autoimmune diseaseis multiple sclerosis.

In another embodiment, the inflammatory disease or condition has anetiology associated with production of at least one pro-inflammatorycytokine selected from IL-6 and TNF-α, as discussed herein.

The following examples are to be considered merely as illustrative andnon-limiting in nature. It will be apparent to one skilled in the art towhich the present invention pertains that many modifications,permutations, and variations may be made without departing from thescope of the invention.

EXAMPLES Example 1 Peptide Selection from Phage Display Libraries

The monoclonal anti-PAb-421 antibodies Idi-1 and Idi-2 were generatedand characterized as described (Herkel et al., 2004). Briefly, BALB/cmice were immunized three times with PAb-421 and the spleen cells of themouse that produced the highest anti-PAb-421 titers were fused with NSOmyeloma cells. Supernatants of the growing cells were screened by ELISAfor binding to PAb-421 and to DNA. The hybridomas Idi-1 and Idi-2 wereisolated and cloned twice by limiting dilution.

Ph.D.-7 or Ph.D.-12 libraries from New England Biolabs, Frankfurt,Germany were screened according to manufacturers instructions. Briefly,three rounds of selection by Idi-1 or Idi-2 monoclonal antibodies wereperformed and consensus peptide sequences were identified by sequencingof phage DNA. Candidate peptides were then synthesized by Sigma-Genosis(Pampisford, UK) and further studied in functional assays, as describedhereinbelow.

Example 2 Examining the Effect of Candidate Peptides on p53-MediatedGrowth Arrest

The selected candidate peptides were tested for their ability tointerfere with the p53-mediated cellular stress response by testingtheir capacity to inhibit the response to hyperthermia of the L12 cellline (Wolf, 1984), which lacks endogenous p53 activity and had beenstably transfected with the p53 gene or a control vector. In thesecells, p53 activity induces growth arrest and cell survival rather thanapoptosis in response to hyperthermia (Nitta, 1997).

The amount of cell death was assessed by staining the cells with thevital dye trypan blue (Sigma) and counting the ratio of dead/live cellsper visual field with a light microscope.

Results: incubation for 2 hours at 42° C. induced death of all cellsthat lacked p53 and, in contrast, transient growth arrest and survivalof about 80% of the cells with active p53. Four peptides, designatedStressin-1 to -4 (for STress RESponse Specific peptide INhibitor), wereidentified that at concentrations of 100 μg/ml inhibited p53-mediatedgrowth arrest after hyperthermia and induced death of almost all cellswith active p53, which is the response of L12 cells that lack p53activity (Table 1); the peptide sequences are shown in Table 2.

TABLE 1 Incidence of cell death induced by hyperthermia in L12 cellswith or without active p53 and inhibition of the p53-dependent stressresponse by Stressin peptides. no peptide Stressin 1 Stressin 2 Stressin3 Stressin 4 L12 without p53 100% n.d. n.d. n.d. n.d. L12 with p53  20%100% 90% 80% 80%

TABLE 2 Amino acid sequences of Stressin peptides that modify thecellular response to stress. SEQ ID NO: Amino acid sequence Name 1LPPLPYP Stressin-1 2 DLSTDALHYRTA Stressin-2 3 HPTNQQSLWRWP Stressin-3 4SSLSVDYPTRYP Stressin-4

Example 3 Effect of Stressin Peptides on p53-Mediated Cell Death Inducedby DNA Damage

L12 cells were treated for 48 hours with 50 μM of the DNA-damaging agentCisplatin and p53-mediated cell death was determined by measuring theDNA content of cells stained with propidium iodide (FIG. 1). Cellsincubated in the absence of peptide responded to Cisplatin treatmentwith p53-mediated cell death.

Results: FACS analysis shows that treatment with Stressin-1 orStressin-2 rescued 35% or 25% of the cells, respectively, fromp53-mediated cell death.

Example 4 Effect of Stressin Peptides on p53-Mediated Cell Death inNon-Transformed Cells

Mouse embryo fibroblasts (MEF) were treated with cisplatin (80 μM) inthe presence or absence of Stressin-1 peptide as described in Example 3,and cell death was assessed by incorporation of the vital dye Neutralred (Sigma, Taufkirchen, Germany), O.D. at 540 nm was read in an ELISAreader.

The percent of viable cells is presented in FIG. 2A; viability wascalculated by the equation:

Cell viability=sample OD₅₄₀×100/OD₅₄₀ of untreated cells.

Micrographs of the treated cells are presented in FIG. 2B.

FIG. 2 shows that Stressin-1 inhibited cell death of MEF cells inducedby 80 μM Cisplatin in a dose-dependent way with maximal efficiency at aconcentration of 50 μM.

Example 5 Effect of Stressin Peptides on Cell Death Induced by ToxicStress

To learn whether Stressin peptide may protect from toxic stress, primaryhepatocyte cultures were incubated with or without ethanol at aconcentration of 0.6%, and with 50 μM Stressin-1 or without peptide.After 48 hours, the numbers of dead and alive cells were determined bytrypan blue exclusion (Table 3).

Results: All hepatocytes exposed to ethanol died in the absence ofStressin-1; in contrast,

Stressin-1 rescued 20% hepatocytes from ethanol-induced cell death.

TABLE 3 Survival of hepatocytes exposed to a lethal dose of ethanol ispromoted by Stressin-1 peptide. Untreated Stressin-1 Hepatocytes withoutethanol 100% 100% Hepatocytes with 0.6% ethanol  0%  20%

Example 6 Effect of Stressin Peptides on Mice Subjected to γ-Irradiation

BALB/c mice were subjected to whole body γ-irradiation (6.5 Gy). Onehour after irradiation, the mice received intraperitoneally eitherStressin-1 (n=7; SEQ ID NO:1) or a modified, retro-inverso Stressin-1peptide (n=7; SEQ ID NO:5), both at a concentration of 500 μg/mouse, ora sham injection with saline (n=6). The retro-inverso peptide was usedto determine whether prolonged in vivo-half-life would give anadvantage.

Results: After 17 days, 66% of the sham-treated group were dead; incontrast, none of the mice treated with the Stressin-1 peptide and only29% of the mice treated with the modified Stressin-1 peptide were dead.After 40 days only 33% in the sham group recovered from radiationdisease; in contrast, 57% and 86% of the mice treated with the modifiedor the unmodified Stressin-1 peptide recovered from radiation disease(FIG. 3).

Example 7 Effect of Stressin Peptides on LPS- and CpG-Induced CytokineSecretion

To learn whether Stressin peptides may modify the inflammatory responseto stress signals, the response of RAW 264.7 macrophage line cells topro-inflammatory microbial signals, lipopolysaccharide (LPS) and CpGoligonucleotides, was studied. The cells were incubated with LPS or CpGoligonucleotides in the presence or absence of Stressin-1 (50 μM). After6 hours, the amounts of secreted TNF-α (FIG. 4) or Interleukin-6 (FIG.5) in culture supernatant, as a measure for macrophage activation, weredetermined by specific ELISA reagents and anti-TNF-α and anti-IL-6antibodies (R&D Systems, Wiesbaden, Germany).

Results: Stressin-1 inhibited macrophage activation and secretion ofTNF-α and Interleukin-6 induced by both LPS and CpG oligonucleotides.

Example 8 Stressin-1 Protects Mice from Experimental Autoimmune Disease(EAE)

MBP Acl-9-specific T cell receptor-transgenic Tg4 mice (Liu et al.,1995) were immunized subcutaneously with 200 μg of modified (Y atposition 4) Act-9 peptide in complete Freund's Adjuvant followed byintraperitoneal administration of 200 ng of Pertussis toxin the nextday. At one hour after MBP immunization one group of mice (n=4) received100μl of PBS intraperitoneally and another group of mice (n=6) received500 μg Stressin-1 peptide in 100 μl PBS intraperitoneally. The mice werethen tested for the development of experimental autoimmuneencephalomyelitis by assessment of the clinical EAE score. As can beseen in FIG. 6, Stressin-1 protects mice from EAE.

Example 9 Sequencing of Idi-1 and Idi-2 Variable Regions

Total RNA was extracted from Idi-1 and Idi-2 hybridomas using TriReagent(Molecular Research Center, INC.), and the RNA was used as a templatefor cDNA synthesis using SuperScript Reverse Transcriptase (Invitrogen,Karlsruhe, Germany). PCR amplification of the heavy and light chainvariable regions were performed using primers specific for therespective flanking constant region: 5′CGGGAATTCCCCAGGTGCAGCTGCAGCAGTCTGG SEQ ID NO:25 and 3′GCGGGCCCTCGAGTCTATGTACATATGCAAGGCTTACAACC SEQ ID NO:26 for the heavychain; 5′ CGCGCAAGCTTGATATTGTGATAACCCAGGATGA SEQ ID NO:27 and 3′GATGGTGGGAAGATG SEQ ID NO:28 for the light chain. PCR products werepurified and sequenced using the same primers.

The variable regions of Idi-1 (Idi-1 V_(L)—SEQ ID NO:9; Idi-1 V_(H)—SEQID NO:10), Idi-2 (Idi-2 V_(L)—SEQ ID NO:11; Idi-2 V_(H)—SEQ ID NO:12)and PAb-421 are presented in FIG. 7. The CDR sequences of Idi-1 andIdi-2 are indicated in FIG. 7 and listed, along with their correspondingSEQ ID NOS, in Table 4 below:

TABLE 4 CDR sequences of Idi-1 and Idi-2 SEQ ID NO: Description Aminoacid sequence 13 Idi-1 V_(L) CDR1 RQSLLYKNGKTYLN 14 Idi-1 V_(L) CDR2LMSIRAS 15 Idi-1 V_(L) CDR3 QQLVEYPYT 16 Idi-1 V_(H) CDR1 KASGYIFTSYWIN17 Idi-1 V_(H) CDR2 NISPADSSTNYN 18 Idi-1 V_(H) CDR3 EEVRRRRDMDF 19Idi-2 V_(L) CDR1 QASESVSFAGTSLMH 20 Idi-2 V_(L) CDR2 RASKLES 21 Idi-2V_(L) CDR3 MQSMEDPYT 22 Idi-2 V_(H) CDR1 KASGYSFTGYTIN 23 Idi-2 V_(H)CDR2 LINPYNGGTCYN 24 Idi-2 V_(H) CDR3 RVWLRRDGFYYAMDY

While the present invention has been particularly described, personsskilled in the art will appreciate that many variations andmodifications can be made. Therefore, the invention is not to beconstrued as restricted to the particularly described embodiments,rather the scope, spirit and concept of the invention will be morereadily understood by reference to the claims which follow.

What is claimed is:
 1. A method for treating a condition selected fromthe group consisting of Parkinson's disease, multiple sclerosis, strokeand myocardial infarction in a subject in need thereof, comprisingadministering to the subject a therapeutically effective amount of apeptide comprising an epitope immunoreactive with an anti-idiotypicantibody directed against an anti-p53 antibody, wherein the anti-p53antibody is immunoreactive with at least a part of the regulatory domainof the C-terminus of p53, and wherein the peptide exhibits at least oneactivity selected from anti-apoptotic activity and anti-inflammatoryactivity wherein the length of the peptide is 7 to 25 amino acids andhas the amino acid sequence as set forth in SEQ ID NO:
 1. 2. The methodof claim 1, wherein the anti-p53 antibody is PAb-421.
 3. The method ofclaim 1, wherein the amino acid sequence of said peptide is as set forthin SEQ ID NO:
 1. 4. The method of claim 1, wherein the peptide isadministered to the subject by a route selected from oral, topical,transdermal and parenteral.
 5. The method of claim 1, wherein saidcondition is Parkinoson's disease.
 6. The method of claim 1, whereinsaid condition is multiple sclerosis.
 7. The method of claim 1, whereinsaid condition is myocardial infarction.
 8. The method of claim 1,wherein said condition is stroke.